#1 Goldberg

One legend who had quite a rollercoaster 2019 was Goldberg, who was battered and criticized for his match against The Undertaker at Super Showdown. The Hall of Famer then had a match against Dolph Ziggler, a squash match to sort of help rebuild his credibility.
Goldberg may be set for another match, if what he said on Stone Cold Steve Austin's Broken Skull Sessions is any indication. The WCW legend said that he owes Undertaker "a receipt", indicating that he wants another match with The Phenom.
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Goldberg could perhaps return at Royal Rumble, eliminate a few Superstars, appear on RAW the next day, and challenge The Undertaker once again. Or perhaps the legend could set up a match with some other legend at the Royal Rumble match. If Goldberg wants another match, the Royal Rumble match could be a great way to set it up.